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(No Model.)

N. W. WILLIAMS.

PLOW BEAM No. 409,623 Patented Aug. 20, 1889.

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UNITED STATES PATENT OFFICE.

NORMAN \V. ILLIAMS, OF DETROIT, MICHIGAN, ASSIGNOR OF ONEd-IALF TOCHARLES H. GALE, OF SAME PLACE.

PLOW-BEAM.

SPECIFICATION forming part of Letters Patent No. 409,623, dated August20, 1889.

Application filed October 24:, 1887- Serial No. 253,262. (No model.)

To aZZ whom it may concern.-

Be it known that I, NORMAN W. WILLIAMS, a citizen of the United States,residing at Detroit, in the county of Wayne and State of 5 Michigan,have invented certain new and useful Improvements in Plow-Beams, ofwhich the following is a specification.

The objectI have in view is to so construct a plow-beam as thatit shallhave the strength of an iron beam, with less weight and without itsliability to break or become permanently flexed; that it shall have theresilience or elasticity of a wood beam, with greater strength and lessbulk, and to provide a 1 means for more securely and convenientlyattaching a j ointer or eolter than heretofore.

To these ends, my invention consists in making the beam of a small,square, and straight bar of wood, strengthened or trussed between asuperposed box-like malleable easting and a lower channel-plate of likematerial, both extending over the weak points in the ordinary beams, thewhole secured by a single bolt, in addition to the usual draw- 2 5 bolt,rising from the standard, as more fully hereinafter set forth; also inproviding the said box-casting with a transverse slot adapted to receivethe top-bolt of a pair of short gripstraps, whereby the shank of ajointer or eolter may be adjustably secured to the beam.

Figure 1 is a side elevation of the middle portion of my improved beam.Fig. 2 is a longitudinal vertical section of the same.

"' In the drawings, A is a straight wooden bar, two and onehalf inchessquare, and of proper length for the kind of plow to which it is to beattached.

B is a malleable castiron box, open at the 40 bottom, where its edges toare flared to embrace the top corners of the bar A from a point back ofthe draw-bolt D toward the clevis far enough to resist and overcome anytendency of said bar to spring or bend upward under working stress.

0 is a channel-plate of the same material, whose edges or flanges cembrace the lower corners of the bar A. It is interposed between saidbar A and the shoulder of "the landsidestandard, all being securedtogether by the ordinary draw-bolt D in the usual manner, while an extrabolt E binds their fore parts. This channel-plate has openings cored inits main web to lighten it, as seen in Fig. 2.

A pair of grip-straps F have a bolt (Z, which passes through atransverse slot 1) in the box 13, and another (Z through eyes at theirpendent ends. The land grip strap F is made with a circular curve whereit 6c passes the beam, to permit the insertion of the shank G of aeolter or jointer, which shank should be the section of a cylinder incross-section. This construction will permit of easy adjustments forheight or depth and 6 5 inclination for pitch, as will readily be seen.

As compared with an all-iron beam, the present construction is about tenpounds lighter, costs less, and is better adapted to resistflexing-strains, which would break or bend the former. \Vood beams areusually made from three by six inch stock, sawed to shape, which bringsflexing-strains diagonally across the. grain in a portion oftheirlength.

It is well known that wood beams do warp, besides being bulky andclumsy, made so by the necessity of guarding against the weakness causedby the large hole for the drawbolt, which cuts away one-third of theirthickness. In my improved construction the straight small wood bar istrussed and clamped between flanged castings, the whole being welladapted to resist torsional or flexingstresses in all directions.Particularly is this the case with relation to strains resulting fromthe plunging or upward jerking of the team where the casting B is madewith deep sidesin effect becoming a strong girder.

One or more transverse webs may be molded in said box casting to preventthe thin webs or sides from buckling.

Steel castings or drop-forgings can, of course, be used in lieu ofni'alleable castings, if preferred.

That I claim as my invention is- The metallic girder-box 13, having thetransverse slot 1), adapted to receive the bolt cl of the grip-straps F,in combination with the channel-plate G and straight wooden bar 100 A,substantially as set forth.

NORMAN W. VILLIAMS.

Witnesses:

ll/IARIE J. EBERTS, H. S. SPRAo-Un.

